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<b>let </b><font color="Maroon">x</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="arytm_2.html#K2">REAL+</a> ;<br/>

<a NAME="E1:12"/>
<font color="Maroon">x</font> <a href="arytm_2.html#R1">&lt;='</a> <font color="Maroon">x</font>
 
;<br/>
<a NAME="E2:12"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">x</font> <a href="arytm_1.html#K1" target="_self">-'</a> <font color="Maroon">x</font></span>)</span> <a href="arytm_2.html#K7">+</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:12"/>
<font color="Maroon">x</font> <a href="arytm_1.html#K1" target="_self">-'</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a>  <a href="arytm_3.html#K13">{}</a> 
 <b>by </b><i/>;<br/>


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